A field system, in archaeological terms, is exactly what it sounds like: the physical remains of ancient boundaries, enclosures, and cultivation plots, typically visible as low earthen banks, stone walls, or slight ridges that only careful observation or the right angle of winter light will reveal. These features are found across Ireland in considerable numbers, but each one represents a specific community at a specific moment, organising the soil around them for grazing, tillage, or both.

Carrowcor is a Gaelic place name, and like many townlands along the western seaboard of Mayo, it sits in a landscape that has been continuously shaped by human hands across several millennia. Field systems in this part of Ireland range in date from the Neolithic period onward, and some of the most remarkable examples in the country, preserved beneath blanket bog, survive not far away in places such as the Céide Fields near Ballycastle. Without more specific detail available for this particular site, it is not possible to say with confidence how old the Carrowcor system is, who made it, or what form its boundaries take on the ground. What is certain is that it has been recorded as a monument, which places it among the physical traces of past land use considered significant enough to formally document.